Annunciator.



PATENTED AUG. 4, 1903.

ELM. HEWLETT. ANNUNGIATOR.

APPLIOATION FILED AUG. 3, 1900.

H0 MODEL.

Fig.1.

Invent r: Edward M- Hewett.

No. 735,511. Patented August 4, 1903.

UNITED STATES PATENT OFEIcE.

EDWARD M. HEWLETT, OF SOHENEGTADY, NEW YORK, ASSIGNOR TO GEN- ERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent No. 735,511, dated. August 4, 1903.

Application filed August 3, 1900. Serial No. 25,848. (No model.)

T at whom it may concern: 1 represents the insulating-support, which Beit known that I, EDWARD M. HEWLETT, a may be the switchboard of a charging-sta citizen of theUnitedStates,residingatSchen tion, on the rear of which are bus-bar terectady, county of Schenectady, State of New m'inals, such as 2, communicating with ter- 5 York, have invented certain new and useful minals 3 3 on the front of the board, he- Improvements in Annunciators, of which the; tween which is connected the coil at of an anfollowing is a specification. nunciatormagnet. This is provided with This invention relates to electric annuncia-' iron heads 5 5 forming pole-pieces. The tors, the object being to adapt the annunlowerhead is extended,soas toformabracket to ciator-drop after being actuated to'communisupporting the annunciator parts, a stud 6, cateadeterminate signal to be set to anew posecured to the rear end of the bracket, pro-. sition, adording an indication to an attendant jecting through the switchboard and being that the signal has been received and yetleave firmly clamped thereto by means of a nut, as the parts in a position indicatingthat the indicated in Fig.1. The pole-pieces of the I5 annunciator is not in normal position with remagnet are connected by a piece of non-magspect to the circuit. netic 'sheet metal 7, the ends of which are The device is particularly adapted for servbent at rightangles and secured to the poleice in charging storage batteries. In operpieces by screws, as indicated in Fig. 1, and ating automobiles driven by power derived the front face of which is provided with an 20 from storage batteries the latter may be indicating number or character to signify the charged by a source of current in the circuit location or individuality of the annunciator. of which is an annunciator of the character In ears integral with the bracket 5 is pivdescribed above adapted to release its drop oted an L-shaped armature, of cast-iron, 8, when the batteries are sufticiently charged. provided with an ear at its top to form a stop 25 The release of the drop closes an alarm-cirfor engagement with an adjustment-screw 9.

cuit, calling the attention of the attendant to The bracket 5 is also provided with a dethe fact that thebattery has been charged. pending integral extension having a hook 10, The attendant may then raise the drop to an which cooperates with a spring-pressed plunintermediate position,in which it is supported ger 11, carried by the armature, which is 30 by a latch. He thereby opens the alarm-cirmounted in a tubular socket secured to the cuit, stopping the ringing of the bell or other armature and carries a pin having a head or audible indicator, and opens the charging-cirenlargement on the rear end, as indicated at cuit. The position of the annunciator-drop 12 in Fig. 3, the head being larger than the serves as a continuing indication of the. opening in the socket, and adapted when 35 charging-circuit which was used. The parts pushed in to lie in the path of the h0ok.l0

may be so adjusted that in this position of and may retain the armature in an intermethe drop its armature will be within thefield diate position, as indicated in Fig. 3. of force of the controlling-magnet to such an When the armature is released, it drops to extent that when the full potential'of the the dotted position shown in Fig. 1. During 4o charging source is again put upon the magcharging it is held up by the charging-curnet the armature will be drawn up to a closed rent,'which effects a strong magnetization of position. the annunciator-magnet; The armature car- My invention comprises various features fries-a metallic bridge, of copper, 13, which the novelty of which will be hereinafter more spans two spring-contacts 14 14*, secured to 9 45 fullydescribed,anddefinitelyindicatedin'the terminals at the rear of the board and'conclaims. necting with an alarm-circuit,including a In the accompanying drawings, which illusbell or other audible indicator and a battery trate the invention, Figure 1 is a side elevation or other source of electric potential. The anof an annunciatorembodying my improvenunciator is included in the charging-circuit, ICO 5o ments. Fig. 2 is a front view, parts being and when the battery being charged reaches broken away. Fig. 3 is a sectional view. the required potential the underload-magnet 4 becomes weakened sufficiently to permit the armature 8 to fall under the influence of gravity, thereby closing the alarmcircuit and notifying the attendant that the battery is sufficiently charged. The attendant may then disconnect from circuit the battery being charged, and in order to leave a temporary record of the circuit which did the charging he may hook the annunciator-drop in its intermediate position, as indicated in Fig. 3, thereby leaving the drop-number sufficiently exposed to be seen and stopping the alarm Without operating a switch or other part,which would require special attention and by being overlooked might create trouble. On using the same charging-circuit a second time the annunciator-drop may be raised to the position indicated in full lines in Fig. 1. thereby covering its number. If desired, the parts might be so arranged that upon the inclusion of the annunciator-magnet a second time in the charging circuit the rush of current through the discharged battery of the automobile will draw up the armature of the annunciator from the intermediate position to the closed positionthat is to say, the annnnciator-magnet will be so adjusted as to pull up the armature from the intermediate posi tion by reason of the "cry strong magnetic field developed by the first rush of chargingcurrent.

WVhat I claim as new, and desire to secure by Letters Patent of the United States, is

1. An electric annnnciator provided with means for supporting the movable member in intermediate position between the closed and open positions, and a detent forming a part of the drop for engaging said supporting means.

2. An electric annunciator provided with a spring-pressed latch for supporting the drop in a position intermediate between the open and closed positions.

3. An electric annunciator carrying a circuit-closer for an alarm-circuit operated by its drop and provided with means for supporting the drop in a position to permit the indicator of the annunciator to be seen while the alarm-circuit is open.

4. An annunciator comprising an underloadcontrolling magnet, and means for supporting the drop in an intermediate position between its full open and closed positions within the grasp of the magnet when it carries full current.

5. An annunciator comprising an underload-controlling magnet, an alarm-circuit energized by the drop, and means for supporting the drop to hold the alarm-circuit open when the controlling-magnet is denergized.

In witness whereof I have hereunto set my hand this 27th day of July, 1900.

EDWARD M. HEWLETT.

Witnesses:

BENJAMIN B. HULL, JAMES J HIGGINS. 

